Which of the following plants is not an example of long day plants?
Hyoscyamus niger (Henbane)
Spinacia (spinach)
Beta vulgaris (Sugar beet)
Xanthium pennsylvanicum (Cocklebur).
Long Day Plants:
Some examples of long day plants which are also called as short night plants are Hyoscyamus niger (Henbane) Spinacia (spinach) Beta vulgaris (Sugar beet)